Staple fiber yarn



yatented Aug. i2, 194! STAPLE FIBER. YARN Harry Wild, London, England, assignor to Colanese Corporation of-America, a corporation of Delaware No Drawing. Application June 27, 1939, Serial No. 281,327. In Great Britain July 16, 1938 Claims.

cellulose acetate or other organic ester of cel" lulose. Preferably, the proportion of the cellulose acetate or other organic derivative of cellulose fiber in the cellulose derivative/wool/cellulosic fiber mixed yarn is at least 50%. Secondly, the invention comprises a doubled yarn having at least one mixed fiber yarn of the character just described as a component. Thirdly, the inventhe viscose fibers may be cut to any desired A suitable denier for the cellulose derivative fiber is approximately 3 /2; a similar denier is suitable for viscose fibers; cotton fibers will have a somewhat finer denier; and generally speaking the tion comprises a doubled yarn having as its components at least onemixed fiber yarn of the character described and at least one stapilized yarn, e. g. a yarn produced by subjecting a continuous filament yam to the action of a cutting surface moving in the same general direction as the yarn,

but at a different speed, or by otherwise severing the filaments at intervals along a continuous filament yarn.

The mixed yarn comprising cellulose derivative fibers and lesser proportions of cellulosic and wool fibers has an attractive appearance and enables useful effects to be obtained by reason cotton enables the mixed yarn to be spun at higher spindle speeds, thus making for more economical use of the spinning machinery.

The three kinds of fibers should have approximately the same length, so as to enable them to be drafted into a uniform product, and spun on ordinary spinning machinery of a type appropriate to the fiber length of the cotton-like component. Generally speaking, the presence of cotton fiber necessitates the other two fibers being of a length not exceeding 2 inches, for example all three fibers may have a length of 11's inches. If, however, viscose fibers are employed as the cellulosic component, other (and, particularly,

longer) fibers may be used for the mixture, since wool fibers a somewhat heavier denier, say 4-4 The proportions of ,the three kinds of fiber in the yarn, or (in the case of a doubled yarn) in one of the component yarns, may vary within substantial limits, it being impo tant, however, that the proportion of the cell ose derivative staple fiber preponderates over that of eitherof the other fibers, and, as already indicated, preferably over both. Thus, for example, one suitable mixture comprises 50% cellulose acetate fibers, 25% cotton fibers, and 25% wool fibers, the cellulose acetate fibers and the wool fibers being cut to about 11 inches to conform to the length of the cotton fibers. Another mixture giving a product in which the characteristics of the artificial staple fibers are more pronounced comprises 62 /2% cellulose acetate fibers, 12Vz% cotton fibers, and 25% wool fibers. Mixtures such as those described above may be formed into yarns of say 26s cotton count, twist being insorted. to about 16 turns per inch, a twist constant of about 3 beinguse'd.

Mixture yarns such as those described above may be used as a single yarn for weaving or knitting, or as has already been mentioned, they may be used as components in doubled yarns. A

particularly useful yarn results by twisting one "such mixed yarn with a stapilized yarn, a spiral effect being obtained with the stapilized yarn wrapping round the outside of the mixed yarn. The stapilized yarn is preferably made from bright (undelustred or unpigmented) filaments to contrast with the mixed yam, which, because of its general staple character, together with its wool and cotton content appears dull. The bright fibers of the stapilizedyarn against the dull ground of the other component gives a particularly attractive efi'ect. Such a yarn is useful for the production of knitted fabric, particularly underwear, and for this purpose may be knitted on plain circular web machines and rib machines.

As a particular example of a. doubled yarn using a mixed yarn as one component and a stapilized yarn as another, there may be doubled with a 26 count mixed yarn as described above, a stapilized yarn of equivalent weight, say 190 or 200 denier, having an average staple length of about 6 inches with a filament denier of 2, 2 or 3, thus giving the final yarn a cellulose derivative content of about 75-80%. The mixed yarn has 16 turns per inch 8 twist, and the staplised yarn 6 turns per inch Z twist. The two yarns are doubled together with an S twist of 7 turns per inch.

Having described my invention, what I desire to secure by Letters Patent is:

1. Doubled yarn having as at least one of its components a staple fiber yarn comprising a substantial proportion of fibers made from artificial continuous filaments having a basis of cellulose acetate or other organic derivative of cellulose, together with a lesser proportion of wool fibers, and another lesser proportion of cellulosic fibers,

and having as another of its components a 20 stapilized yarn.

2. Doubled yarn according to claim 1, wherein the stapilized yarn has a basis of cellulose acetate or other organic derivative of cellulose.

3. Doubled yarn according to claim 1, wherein the stapilized yarn is wrapped round the mixed fiber yarn. r

4. Doubled yarn according to claim 1, wherein the stapilized yarn is made from bright filaments to contrast with the mixed fiber component.

5. Doubled yarn having as at least one of its components a staple fiber yarn comprising a substantial proportion of fibers made from artificial continuous filaments having a basis of cellulose acetate or other organic derivative of cellulose, together with a lesser proportion of wool fibers, and another lesser proportion of cellulosic fibers, and having as another of its components a stapilized yam, the proportion of the cellulose derivative fiber being at least 50%.

HARRY WILD. 

